8. what is dominant mode in waveguides

Sunday, 23 February 2014

For a waveguide the dominant mode is the mode with the lowest cut off frequency.

Single mode propagation reduce losses, so we use dominant mode propagation.The waveguide can be operated only in the dominant mode for a certain range of frequency, this range of frequency extend from cut off frequency of dominant mode to the cut off frequency of next higher mode.

In rectangular waveguide the dominant mode is TE10, and for circular waveguide the dominant mode is TE11.